55644018797866 has 4 divisors (see below), whose sum is σ = 83466028196802. Its totient is φ = 27822009398932.

The previous prime is 55644018797819. The next prime is 55644018797869. The reversal of 55644018797866 is 66879781044655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54626452322841 + 1017566475025 = 7390971^2 + 1008745^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55644018797792 and 55644018797801.

It is not an unprimeable number, because it can be changed into a prime (55644018797869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13911004699465 + ... + 13911004699468.

Almost surely, 2^{55644018797866} is an apocalyptic number.

55644018797866 is a deficient number, since it is larger than the sum of its proper divisors (27822009398936).

55644018797866 is a wasteful number, since it uses less digits than its factorization.

55644018797866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27822009398935.

The product of its (nonzero) digits is 2438553600, while the sum is 76.

The spelling of 55644018797866 in words is "fifty-five trillion, six hundred forty-four billion, eighteen million, seven hundred ninety-seven thousand, eight hundred sixty-six".